Apparatus for cutting threads on pipes, &amp;c.



E. L. LIDKB. APPARATUS FOR CUTTING THREADS ON PIPES, 6w.

APPLICATION FILED FEB. l, 1907.

9&2fl Patented Nov. 10, 1908.

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2 LN i- M g I5 8 WITNESSES: INVENTOR x? c. Wfig B. L. LIDKE. APPARATUSFOR CUTTING THREADS 0N PIPES, (Kw. APPLICATION FILED IEB. 1, 1907.

VVITNESSES: INVENT R. %.I C. M @MfifiM/fi iio Patented Nov. 10,1908.

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- and its associated die. or chaser.

=features of my invention,

EDWARD L. LIDKE, OF' TOLEDO, OHIO.

' APPARATUS FOR CUTTING THREADS ON PIPES, &c.

Specification of Letters Patent.

PatentedNovr 10, 1908'.

Application filed February 1, 1907. Serial No. 355,2 73.

To all whom it may concern:

Be it known'that I, EDWARD L. LIDKE, a citizen of the United States, anda resident of Toledo, in the county of Lucas and State of Ohio, haveinvented a certain new and i useful Apparatus for Cutting Threads onlipes, &c. and I do. hereby declare the following to .be a full, clear,and exact descri tion of the invention, such as will enab l othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to the figuresofreference marked there- 1 on, which form a part of-this specification.

This invention relates to that class of mechanical appliances for use incutting screwthreads on metallic pipe or other cylindrical objects, andmore particularly to that class of apparatus which has a guide part clamed to the work and a head movable relative t iereto and carrying aseries of dies or chasers for cutting the thread.

The primary object of the invention is to provide an improved andhighly-ellicient device of this class which is capable of cutting eithertaper or straight threads, and in which the dies or chasers,'when apredetermined length of taper thread has been cut, are automaticallythrown .to inoperative position to permit a removal of the device fromthe work without back turning.

A further object of my invention is to provide an apparatus. for cuttingtaper threads which has die moving means cooperating with the end of theob'ect being threaded, whereby a longitudinal movement of the objectrelative to the die carrying head imarts therequisite radial movement tothe ies.

Further objects of the invention will be apparent by reference to thefollowing specification, and to the accompanying drawings, in which,

Figure 1 is a central longitudinal section of a thread-cutting apparatusembodying-the taken on the dotted lines x--.r in Fi 3, the same beingoperatively associate with a pipe. Fig. 2 is a side elevation of theapparatus in partial section on the dottedline y in Fig. 3, with therunway bars and their carrying part partly-extended relative to thehead. Fig. 3 is a top plan view of the same with the ad justinghand-wheel removed, and Fig. 4 is a perspective view of one of therunway bars ment, the outer lower-ring 11, which Referring to thedrawings, 1 designates a. cylindrical die-carrying head, which is formedon its outer face with a series of radial grooves or die-ways 2 in whichthe dies or chasers 3 have a free radially-sliding movesides of saidgrooves or ways being closed by a fiat ring 4, which is secured to thehead end.

Threaded interiorly to the innerend of the head 1 is a guide 5, which isprovided with a.

removable bushingor supplemental guide 6, and is secured to the pipe orother work 7 by one or more hand-screws 8, passing radially into theguide and bushing so that their inner ends will contact with the work.It is apparent that thebushing or supplemental guide 6. is of a sizeadapted to suit the diameter of the. work.

Secured to the outer end of the head 1 by a series of bolts 9 extendingloosely through holes 10 in thering 4 and head-casing is a fol-v isnormally retained in.

abutment with the head by the action of the coiled compression springs12, which are carried by the bolts and cooperate with them and the ring4 as shown in Fig. 2. Rigidly secured to the follower-ring 11 andprojecting inwardly therefrom are a series of runway bars 13 whichcorres 0nd in number to the number of dies or oil have their endsprojectin holes 14 in the head 1, saic l holescoincidin with the groovesor die-ways 2 and bein o greater width than said die-Ways. Each a1" 13is longitudinally slotted from its inner end. for a considerable portionof its length, as at 15, to enable it to straddle the associated die orchaser 3, and has its legs each provided with runways extending lenthwise thereof. and in which rollers 16, carrie on each side of. thedie, operate. The inner ends of these runwa s are tapered for aconsiderable portion 0 their length, as at 17, to conform to the tapertobe given the thread, and are abruptly angled outwardly relative to thehead, as at a point 18 therein, to throw the inner die e'nds clear ofthe work as the rollers 16 follow the angled courses of the runways.From the points 18 to the ends of the barsthe runways continue in astraight course tov permit the bars .to be drawn from the head and fromengagement with the rollers-16 so that the dies or chasers may beremoved for the purpose ofsubstitution or repair.

Secured to the outer face of the followerring 11 by screws 19 andclosingthe opening within suitable asers 3 employed and.

therein is a follower-plate 20, which is centrally bored and threaded toreceive the screw 21, which carries at its lower end the thrust-plate 22and at its upper end the hand-w eel 23 by means of which it is turned.The plate 22 is capable of turning freely on the screw end and is ofsuitable size to coact with the end of the work 7, as

shown in Fig. 1, so that the follower members and attached bars 13maintain a fixed posi 'tion relative to the work as thehead 1 is turnedupon its guide 5 in the threading o eration. As the head recedes fromthe idllower-ring 11, the dies or chasers 3 are caused to have agradual-uniform receding movement'from the work for the purpose ofcutthe screw head to pass therethrough, as

lturned sli ting the thread on a slight taper, due"to the rollers 16carried thereby traveling in the ta pered portions 17 of the runways inthe bars 13.

Should it be desired to cut a straight thread the device can be easilyconverted for that purpose by simply removing the follower-plate 20 withits attached screw 21 and thrust-plate 22 so as to permit-thefollowerring and attached runway bars 13 actuated by the s rings 12, toremain stationary relative to t e head due to the work end passingfreely through the follower-ring 0 ening'.

To facilitate the removal of the to lowerplate it is provided with slots19 for receivmg the securing-screws 19, one end of each of which slotsis enlarged sufiiciently to permit shown in Fi 3, thus enabling theplateto be tly upon a loosening of the screws an then withdrawn from theattached ring.

While it is apparent that numerous methods can beemployed for manuallydriving v The pinion 25. has its outer end formed with an axial stem orintegral shaft 25 which terminates at its free end in a ratchet-wheel 28with which a pawl 29 carried by an operating handle 30 coacts. The studor spindle 26 is provided with a peripheral groove 31 with which theinner end of a set screw 32 in the pinion 25 coacts toprevent awithdrawal of the pinion. Y

.To thread a pipe into the guide until it comes in contact with thecontiguous sides of the dies or'chasers 3' and is then secured aainstmovernent relative to the guide by t e hand-screws 8. .At

or other object is passed this point the work is also intended tocontact with the thrust-plate 22 when adjusted to permit the maximumlength thread al-' lowed b the tapered runway 17 to be out. As theie-head and cha'sers move longitudinally of the work in forming thethread, the chasers are caused to move radially outward in accord withthe incline or taper of the portion 17 of the runways in the bars 13,due to said bars being maintained in fixed relation to the work by thecontact of the thrustplate therewith. As the angled portions 18 of therunways move past the die-rollers 16 the dies or chasers are thrownabruptly outward thereby sufficient to free them from engagement withthe work, thus permitting a removal of the device from the work, afterthe screws Shave been loosened, without necessitating a backturning ofthe head,it being understood, of course, that the diehead and followerparts must be held distended against the action of the closing: springs12 during such removal inorder to prevent the die-rollers fromreentering the portions 17 of runways and effecting a consequentreengagement of the dies with the work. 1

Should it be desired to cut a thread of less length than the length ofthe tapered portions 17 of the runways and at the same time release thedies from the work at the end'of such cut, the screw 21 is turned in theproper direction to force the follower-parts outward from the die-headuntil the distance between the die-rollers 16 and the angled oints 18 inthe runways is e ual to the lengt 1 of thread desired, thus ena ling thedevice to be set to release the dies from the work at the end of anypredetermined length of thread. To

remove the dies from the diehead it is only necessary to remove the nutsfrom' the ends of the bolts 9, after which the bars 13 and attachedfollowerarts can be withdrawn from the head an the dies then drawnradially from their pockets.

Having thus described my invention, what" mounted in the die-head,longitudinally movable bifurcated bars mounted in the die- 'head andfreely straddling the chasers, said bars having tapered runways, rollerscarried by the chasers and operating in the runways e for efiectingpositive radial movements of t chasers in either direction when the barsare moved relative to the head, and means for ally projecting guideparts, bars longitudilongitudinal intersecting slots one .ofwhichreceives the chasers, the other being tapered and forming runwaysfor the guideparts of the chasers whereby a positive receding movementis imparted to the chasers when the bars are moved in one direction, andmeans for maintaining the bars longitudinally stationary relative to theguide when the die-head and guide have relative longitudinal movement.

3. In, combination, a die head, a guide threaded thereto, radiallymovable chasers mounted in the die-head and having laterally projectingguide-parts, bars mounted in the die-head and movable at right-angles tothe movement of the chasers, said bars having tapered grooves whichreceive and form runways for the guide-parts of the chasers, a ring inadvance of the die-head carrying said bars, members carried by the ringand projecting through I the head, compressionsprings mounted on saidmembers and cooperating therewith and with the head to normally retainthe head and ring in contracted relation, and means carried by the ringand cooperating with the work to move the ring and bars relative to thehead when the latter is turned.

In testimony whereof I have hereunto signed my name to thisspecification in the presence of two subscribing witnesses.

EDWARD L. LIDKE.

